source: mainline/kernel/arch/ppc32/src/context.S

#
# Copyright (c) 2005 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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#include <abi/asmtool.h>
#include <arch/context_struct.h>
#include <arch/asm/regname.h>

.text

FUNCTION_BEGIN(context_save_arch)
        stw sp, CONTEXT_OFFSET_SP(r3)
        stw r2, CONTEXT_OFFSET_R2(r3)
        stw r13, CONTEXT_OFFSET_R13(r3)
        stw r14, CONTEXT_OFFSET_R14(r3)
        stw r15, CONTEXT_OFFSET_R15(r3)
        stw r16, CONTEXT_OFFSET_R16(r3)
        stw r17, CONTEXT_OFFSET_R17(r3)
        stw r18, CONTEXT_OFFSET_R18(r3)
        stw r19, CONTEXT_OFFSET_R19(r3)
        stw r20, CONTEXT_OFFSET_R20(r3)
        stw r21, CONTEXT_OFFSET_R21(r3)
        stw r22, CONTEXT_OFFSET_R22(r3)
        stw r23, CONTEXT_OFFSET_R23(r3)
        stw r24, CONTEXT_OFFSET_R24(r3)
        stw r25, CONTEXT_OFFSET_R25(r3)
        stw r26, CONTEXT_OFFSET_R26(r3)
        stw r27, CONTEXT_OFFSET_R27(r3)
        stw r28, CONTEXT_OFFSET_R28(r3)
        stw r29, CONTEXT_OFFSET_R29(r3)
        stw r30, CONTEXT_OFFSET_R30(r3)
        stw r31, CONTEXT_OFFSET_R31(r3)

        mflr r4
        stw r4, CONTEXT_OFFSET_PC(r3)

        mfcr r4
        stw r4, CONTEXT_OFFSET_CR(r3)

        # context_save returns 1
        li r3, 1
        blr
FUNCTION_END(context_save_arch)

FUNCTION_BEGIN(context_restore_arch)
        lwz sp, CONTEXT_OFFSET_SP(r3)
        lwz r2, CONTEXT_OFFSET_R2(r3)
        lwz r13, CONTEXT_OFFSET_R13(r3)
        lwz r14, CONTEXT_OFFSET_R14(r3)
        lwz r15, CONTEXT_OFFSET_R15(r3)
        lwz r16, CONTEXT_OFFSET_R16(r3)
        lwz r17, CONTEXT_OFFSET_R17(r3)
        lwz r18, CONTEXT_OFFSET_R18(r3)
        lwz r19, CONTEXT_OFFSET_R19(r3)
        lwz r20, CONTEXT_OFFSET_R20(r3)
        lwz r21, CONTEXT_OFFSET_R21(r3)
        lwz r22, CONTEXT_OFFSET_R22(r3)
        lwz r23, CONTEXT_OFFSET_R23(r3)
        lwz r24, CONTEXT_OFFSET_R24(r3)
        lwz r25, CONTEXT_OFFSET_R25(r3)
        lwz r26, CONTEXT_OFFSET_R26(r3)
        lwz r27, CONTEXT_OFFSET_R27(r3)
        lwz r28, CONTEXT_OFFSET_R28(r3)
        lwz r29, CONTEXT_OFFSET_R29(r3)
        lwz r30, CONTEXT_OFFSET_R30(r3)
        lwz r31, CONTEXT_OFFSET_R31(r3)

        lwz r4, CONTEXT_OFFSET_CR(r3)
        mtcr r4

        lwz r4, CONTEXT_OFFSET_PC(r3)
        mtlr r4

        # context_restore returns 0
        li r3, 0
        blr
FUNCTION_END(context_restore_arch)